The JBO Thread Ring Gauge (NoGo) for Metric Fine threads is a precision inspection tool designed to verify external M4 x 0.5 threads. Built for quality teams, manufacturing floors, machinists, and maintenance professionals, it provides a quick, reliable way to confirm that a screw, bolt, or threaded component matches the required size and pitch.

With its durable construction and straightforward design, this NoGo gauge helps inspectors quickly identify non-conforming parts, keeping production on track and ensuring consistent standards across batches.

• Precise metric fine M4 x 0.5 NoGo gauge: Calibrated to verify external M4 x 0.5 threads, ensuring diameter and pitch tolerance align with the 4h class and relevant threading specifications.
• Hardened steel construction for durability: Built to withstand daily use in demanding environments, resisting wear to maintain accuracy over many inspections.
• Right-hand orientation for standard threads: Specifically matched to common right-handed threads, enabling clear go/no-go checks without guesswork.

By delivering fast, repeatable checks, this gauge reduces inspection time, minimizes rework, and helps you maintain consistent quality across parts. Its robust material and precise sizing give you confidence on the shop floor, whether you’re validating incoming components, verifying assembled fasteners, or setting up new equipment. Using this gauge supports efficient quality control, smoother workflows, and improved overall performance in your threading processes.